[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: kde4libs vs qt4

On Tue, Jun 10, 2008 at 4:10 PM, Helge Deller <deller@gmx.de> wrote:
> For Qt it might work as I mentioned without copying atomic.h from glibc.
> Qt uses ldcw() not directly. Instead it uses q_atomic_lock(), which then
> utilizes q_ldcw().
> Here is the code (from src/corelib/arch/parisc/qatomic_parisc.cpp):
>    void q_atomic_lock(int *lock)
>    {
>        // ldcw requires a 16-byte aligned address
>        volatile int *x = align16(lock);
>        while (q_ldcw(x) == 0)
>            ;
>    }
> So, the 16byte alignment is taken care of by align16().
> My attempt was based on having a minimal patch against Qt.

How is align16() implemented? Is the "int *lock" actually a block of
more than 4 ints? If yes, then this will work, and it's similar to the
approach taken by linuxthreads.


Reply to: